R1:dd22db18ff82

Conpherence - make `ZXXX` monograms a bit more useful.

Summary: Ref T7756. Now viewing individual threads in Conpherence is `ZXXX` driven. Also adds remarkup support.

Test Plan: clicked around on list of conpherences in full view and it worked. selected 'view in conpherence' action from column and loaded correct `ZXXX` uri. Typed `ZXXX` in Maniphest and saw it link to Conpherence room.

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin, epriestley

Maniphest Tasks: T7756

Differential…